Open AccessStudy on sensitivity of JOM-4 Overhauser magnetometer
Author(s) -
Jianchang Zhao,
Shudong Chen,
Shuang Zhang
Publication year - 2019
Publication title -
iop conference series. materials science and engineering
Language(s) - English
Resource type - Journals
eISSN - 1757-899X
pISSN - 1757-8981
DOI - 10.1088/1757-899x/563/2/022027
Subject(s) - magnetometer , sensitivity (control systems) , magnetic field , synchronization (alternating current) , interference (communication) , physics , scalar (mathematics) , nuclear magnetic resonance , computer science , acoustics , mathematics , electronic engineering , engineering , telecommunications , channel (broadcasting) , quantum mechanics , geometry
Overhauser proton magnetometer is a scalar instrument for measuring the total magnetic field intensity. Sensitivity, as one of the important specifications, reflects the ability to measure the change of magnetic field when detecting magnetic anomalies. It is very important to study the sensitivity estimation method for accurately evaluating the sensitivity specification of the magnetometer. In this paper, two methods, synchronous measurement method and gradient measurement method, are proposed to estimate the instrument sensitivity. The experimental results show that the lower the external environmental electromagnetic interference is, the more accurate the sensitivity estimation is. Furthermore, when the synchronization accuracy is about 1.7 milliseconds, the estimation results of the synchronization measurement method and the gradient measurement method are almost equal. Finally, in the environment with low electromagnetic interference, the sensitivity estimation of the JOM-4 magnetometers is 0.042 nT@3s.